Product Details

Product Overview

This premium piston ring set, part number 4089406, is specifically engineered for the Cummins QSX15 heavy-duty diesel engine. As a critical component for maintaining compression and oil control, this ring set is manufactured to meet or exceed OEM specifications. We serve a global network of B2B clients, including heavy equipment dealers, engine rebuilders, and fleet operators across North America, Europe, the Middle East, and Asia-Pacific. Our supply chain ensures fast, reliable shipping to major industrial hubs worldwide.

Key Features & Benefits

• Superior Durability: Constructed from high-grade ductile iron with a wear-resistant chrome or molybdenum coating, ensuring long service life in demanding applications.
• Optimized Oil Control: Advanced ring profile design minimizes oil consumption while maintaining a consistent oil film for reduced friction.
• Enhanced Compression: Ensures a tight seal for maximum cylinder pressure, improving fuel efficiency and engine power output.
• Direct Fitment: Precision-engineered to match the exact dimensions of the QSX15 cylinder bore, eliminating the need for modifications.
• Heat Resistance: Designed to withstand the high thermal loads of turbocharged, heavy-duty diesel operation.

Technical Specifications

OEM Cross-Reference

• Cummins OEM: 4089406
• Alternative Part Numbers: 4089406RX, 4089406NX (Replacement/Aftermarket variations)
• Note: This part is a direct replacement for the original Cummins 4089406 ring set. Always verify your engine serial number for compatibility.

Compatibility

• Engine Models: Cummins QSX15 (All variants including QSX15-G, QSX15-T, QSX15-E)
• Vehicle Applications: Heavy-duty trucks, mining haul trucks, construction equipment (excavators, bulldozers), industrial generators, and marine engines.
• Year Range: 2000 – Present (Production years for QSX15 series)

Global Supply & Distribution

• Worldwide Shipping: We ship to all major global destinations via air, sea, and express courier (DHL, FedEx, UPS).
• Major Markets: North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands), Asia-Pacific (Australia, Singapore, UAE), Middle East (Saudi Arabia, Qatar).
• Fast Delivery: Expedited shipping available to industrial centers like Houston, Rotterdam, Dubai, and Shanghai.
• Trade Compliance: All products are exported with full customs documentation and comply with international trade regulations.

Quality Assurance

• Manufacturing Standard: ISO 9001:2015 certified production facility.
• Testing: Each ring set undergoes strict dimensional inspection, material hardness testing, and surface finish verification.
• Warranty: 12-month warranty against manufacturing defects from the date of purchase. Defective parts are eligible for replacement.

FAQ

Q1: Will this piston ring set fit my Cummins QSX15 engine with a different bore size?

This specific set (Part #4089406) is designed for the standard 137mm bore. If your engine has been re-bored to an oversize (e.g., 0.25mm, 0.50mm), you will need a corresponding oversize ring set. Please check the cylinder bore diameter before ordering.

Q2: What is the recommended installation procedure for these rings?

Installation should be performed by a qualified diesel technician. Key steps include: (1) Clean the ring grooves thoroughly, (2) Check ring end-gap in the cylinder bore using a feeler gauge (gap should be within 0.35-0.55mm), (3) Stagger the ring gaps 120° apart to prevent blow-by, and (4) Use a ring compressor when installing the piston into the cylinder.

Q3: How do I identify a genuine Cummins 4089406 piston ring set vs. a counterfeit?

Genuine Cummins parts have a distinct laser-etched part number and a consistent, uniform surface finish. Our aftermarket rings are manufactured to the same high standards but may lack the OEM branding. Always purchase from a reputable supplier with a documented quality control process and warranty policy.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .